1.92ct Valuable Natural Australian Mintabie Semi Black Crystal Opal Solid. From 25+ year old inventory, attractive grayish crystal opal base with very nice flashes of directional multi colored surface fire that is best viewed in direct lighting, transparent, free of crazing, with very nice face up and eye appeal. Custom oval cabochon cut approx. 12.02 x 9.68 x 2.53mm. Beautiful jewelry stone.